Long-distance 2D polarized photoelectric autocollimation device and method for drift quantity returned from feedback of target drone

Abstract

Combination of polarized laser source, polarized beam splitter mirror and quarter Lambda wave plate is adopted in the 2D photoelectric autocollimation tube, which uses characteristic of polarization to avoid that measuring light beam feeds back laser source so as to prevent further angle drift of the measuring light. Obtaining measurement signal of 2D variance in small angle, beam splitter type target detector also obtains angle drift component of separated and fed back light beam. The said component is identical to inherent component of laser source. Monitoring device monitors quantity of angle drift. Based on quantity of angle drift obtained, computer control 2D optical beam deflection device in real time to adjust the measuring light beam according to direction opposite to quantity of angle drift. The invention restrains and eliminates quantity of angle drift coupled in measuring light beam in propagation path of the measuring light beam.

Description

technical field [0001] The invention belongs to the technical field of precision instrument manufacturing and precision testing and measurement, and in particular relates to a long-distance high-precision two-dimensional polarized photoelectric self-collimation device and method for feedback of a drift target. Background technique [0002] With the continuous improvement and improvement of measurement technology, the development of modern high-precision measurement technology and azimuth targeting and tracking system has put forward higher and higher requirements for the measurement accuracy of small angles. Photoelectric autocollimator plays an irreplaceable role in small-angle precision measurement, high-precision aiming and positioning. It can be used as a component of optical measuring instruments such as goniometers and optical comparators, and can also be used alone in measuring instruments for optical Measurement, assembly and adjustment of aerospace instruments and a...

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Problems solved by technology

[0007] In practical application, it can be seen that although the above measurement scheme suppresses the angular drift of the beam to a certain extent, the above measurement scheme is only aimed at the application of a specific laser line reference, and the control object is the center position of the laser beam

However, in the practical application of two-dimensional photoelectric autocollimator, especially in long-distance applications, it is required to introduce feedback control to measure the angular drift of the beam while accurately measuring the two-dimensional small angle change. Due to the high-resolution characteristics of the two-dimensional photoelectric autocollimator, the influence of the angular drift caused by the feedback of the laser beam to the laser light source cannot be ignored. The difficulty is that the object of feedback control is the two-dimensional small The change of the angle and the unknown of the controlled object directly lead to the inability to introduce feedback control in the measurement process of the two-dimensional photoelectric autocollimator. Closed-loop feedback control technology eliminates

The angular drift of the measuring beam is not eliminated during the measurement process, and the final mixture causes angle measurement deviation in the measurement results, resulting in poor measurement stability and repeatability of the photoelectric autocollimator in long-distance applications, and the measurement uncertainty is difficult to further improve. This greatly limits the scope of application of photoelectric autocollimators, which is also an important problem that cannot be solved in the actual application of photoelectric autocollimators.

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